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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe76e3ef1499ce6e2d75a43dc933d18386943ebb0fd37edbda5d44d952a3fe5' 
  AND token = 'UzcBRQ5zXc4tB+k6CiQMvA1ijEyz+U+8rQaVd6XtmJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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