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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b2e061daf7171e66b6e0a588f51096a657a4e714d27875e3951843197ed400' 
  AND token = 'ejVszpVkcmHTzb6HNTWb6vgFqs30nRh/REQNMEXe9Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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