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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88409c69f6360636ec755b629290623b23b8700ace036c4c8a49594b7aa8aae4' 
  AND token = '7fZjqUI93MxRDmbc15t7k4WGIftsBUCtAs8RQ1COSrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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