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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6d85cdc020a5f2dfaa4547261554a267085a8d17f199aa7ef9090e489b4043' 
  AND token = 'gqcTd8ivGLX98ZRdvA02ggjz4gWq7VrfhqHRb+9Pqdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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