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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a8882e4714de9566ca214d23c020e388223d5a7c7f125a343fe35bb24e49cc' 
  AND token = 'scgeCvOHstkad8nomE4t6/eB34LlJ4W7nj39H0rqcQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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