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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ea4c44e977db83778dc98a98174eafad432ff43b96ca7f0a12f07a8ce8d7f9' 
  AND token = 'Rlew0Il9WTRHErcsVRmfj8nHK37Zly7TSZz/F2cFMWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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