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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c35b94e64b551d28af0f4b472dde3d133314e7a1c547b98dfb4b6ec5c38db4e' 
  AND token = 'oPWFuxp8KcZmChkILE8OBDVZ0m/j8lEwdrjr/a3O7KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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