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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6def4b92be9ae4e6bd7ddf41f8f6f693936dc048dfa0a1e58ded374f096c51' 
  AND token = 'gV/olK3C9GK+nO7X4ZITLz9yWaLu7R7Hx02YmT/0ee8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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