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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d5093acb692940bdf36424cc91ad2603a51df6a54cb14dab61a3153c16a4af' 
  AND token = 'TBBWnfyeCRmhhDC+w86Uq1F7o3fJllOsHuZ1PT7nRkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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