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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89960751566f3f731d97d7992de71e229189c018f8f9d061a48366af81c1a5c9' 
  AND token = '1G992ZCiEJJTw2b/ea0dOHu7K1GIXtkGtdDbXJwg19Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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