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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a5b4db8689a388338c6f5f8c9056fb3c411164be4b2d460b5fb19ae8a7cb1d' 
  AND token = 'kWrMpP0LVTQLKYo3QjZIqe86dqBDZokWJ/kfkEdtPPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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