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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50a3c9b38d894a98da4cf4ccf11167b9faa90f4015fbcc24db06f58d837c9f73' 
  AND token = 'UWf0pgVElhRMVWc8ntTThf/ULxg8qJMSqAp9I0rynyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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