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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35acd490d48b9bd9f90598b0fdd31e0de01ff0bf777a207af59b4eccc5d8d8e' 
  AND token = 'xJw0CoWXy3OyODjplWZ7p7RQYc4Njq6pe4lAZmAj+lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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