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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0128571515199a8d5466247454d38a50f7a4d5df9237fa0353e4aa5d064791d' 
  AND token = 'lSTSot6P98UdE+dG6nERGRHF44MXFl6YvPA4giMSW7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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