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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a76a9c3ba5a9ff0c646cf2c5b44a3422ac7a371f2d3410f44a6f07e90ee8b03' 
  AND token = 'YOh8ta9WF5+n+3gmHfDG1kZn/9EVSZgbD4fqZ4IR6gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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