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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2620b505a4346192bb2e215468daa9905d6d4a487d1b6cf47189c05bd9ace5a7' 
  AND token = '5Xh14pKoMeh16jcr07ROXyg1N5lEe3nyN0CQ0tdLwPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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