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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5263a841c20c6d68915b1fdbd49f4b658fe47cfdfe9c4e0ab34f5c3ad236ea77' 
  AND token = '6ttrBuv7CXoUlrDv13uxRJVxIzVNSe+6boQo3bkag9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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