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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ab937676d55c4b938cbc2fdee3731e1b9f48b7e4dd7317ea99566e9a1317b8' 
  AND token = '1jnjLqy88SPFYKlddtKVOWrWDMHVPjBQibfTUqRSca0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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