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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdaca2cd1f721e18e8f50d6731513d2b7fce494b10fed89a58cc8edf3ccb1dd7' 
  AND token = '9dFKGkfue5DYa7DLrqR4Ghft/JVuxwEhZZA5hsGUT5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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