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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23ec3bed63f90a7f23ca4bb3f984657c84f963b0681557070d75de954e66e08' 
  AND token = 'uCXjBr1iZ0yEq7AjbnTfO24dh284W7VVw0bLV97nYGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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