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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa61d86660682883461533aa05f6dd9a09facd3044064f242d0bff519b254a59' 
  AND token = 'Ey0EdjCkuNobLqdqKmpdTM4Wr4C3YZk8QMGRtrEKaq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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