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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa852a97d72ab7dcd6f97c8b5ce3f8ca8e1b882d265f43c59cc771225e81710' 
  AND token = 'ERvou+eKvZq5wJ07dnt4l3hNqFL0uC9YTlWmhFtU1LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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