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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b9588e258887e61552333e44598084e7ec4ec7b2a50f3d3ba32ab0231e113f' 
  AND token = 'XOLdoCkVdDCqn1sbs1K/lyWuE0bGlWOjitH+T+j1LVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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