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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e5be687fd75b6805d2c51e127a3fd2e791e43000e9eb7a123fdc58e15acf2ae' 
  AND token = '6k8e9JfyG/CSMrqQaWu3welFI0qFfDNed/5l4J72mhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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