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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886b8efbe5df698c77035e9c32762cb37d31704e6d082778a54996542177793f' 
  AND token = '4iI0LNaT/I7cZz70BLjWGZJfq/8bbSavPIcRIoQDP/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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