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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530acb3fa0360a25690065b7d7a46c3fcdea0633df22c7b2baad74f858d53582' 
  AND token = 'yXQ2JEje6LAnADsdYSv6JpomB2qO198E4ylavV0htgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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