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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05064ebbabd71d78d385c8b09952a6c8ffdc3578a4661e23cacb500be714faa0' 
  AND token = '6BlI/li+LgrBgaNDCB+HJkl+QuQ6aLyXfOfwH4NB/Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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