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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03bcd99c15626d9d8016539ac28d098b666756fc54d67b4b8f6f6c88f342f0a' 
  AND token = 'l64D+Dv0HFAVpjQN4O5BstrGJ039jQ4vCOVC/A5uCAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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