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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad525da8a444ffbdca072d53bcb8f4113e28a216e8fe9c0c35c722e1dbd8967' 
  AND token = 'oQ8Hq2WIJIMxjmjFleR2X8ynzGVErav18l+Hinr1SIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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