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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2ec4a848967d2a20bdaafae9633290e22c7ab448198498e85716a119a1e933' 
  AND token = '8D16kRi51oWVZU2BQcVGWessuphXQUnQQmSXIn13PBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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