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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096c68b0f3a976419532653ec3d8d8d0af6421abe3385c14506760ba15d15ce4' 
  AND token = 'ZwhXuq0dVLns4Sq66xw6N2TaltOfgsg8vuQJztxQu2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}