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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71d288ad54c09c98aeca2f1f31de5d925e2cc02d4d35822ee0d62dd7da29f7b' 
  AND token = 'jPLjNCfCgMGIg26x9A5MlvzlgmsCroBVOaAdTn69AUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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