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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93170a909f0205c8be3e64d7ea7ad483fe1bbb118b17b15ebbb6d12ebc4a94cd' 
  AND token = 'a6HBrCPiWz9HRFx6Ro45bq8rHXVC52TUcZ5lP4lei2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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