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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8641d9dd56c24c5ee123d09f50aaaf839fa2a84936b7accf1c5c955c221eb213' 
  AND token = 'Gr9w5u/FklypaFTswISNMltlgjRPEVq3ELZxPGOOCXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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