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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3764421332e3fa684f935f5967fee8596204af8b7742bdfb29d1985a0ed4fab' 
  AND token = 'm4HjqafzqQMOABoEc9utzrSERY9DSx2EbfHZFGaI6D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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