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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73352237f912f178ea02f743281315001d7a5cac3cada7c95ccc2048d422e62' 
  AND token = 'A2+bkLdVeAMh5B6IsmfoxFqf5eTVc0CxSMwp+OHQRd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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