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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64abac47ebed2446a903d1cb501db9c38b25a7a211fc8d35150ba6dd30fc984b' 
  AND token = 'V0m7Jwk2SaP43bIkFL9AJK9MWuWkNeYJYVKjU02Te8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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