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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2195ec36e481ffac173db23d6198d822d59a9d43debf32ecb5da02ac20395f' 
  AND token = 'Q5aFsk3nc5YD1pmmGPzBK1dDaUO3jS3bpueUFKSHmEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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