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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd265600721a517fb31f6cd04117fd9a2889437caa25af17ed52a531c4d04fd3b' 
  AND token = 'fSgPrNnrYRCtyCITWqIS4RDgPvUaOshCCCkPfXwGV50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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