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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a66f83c092fbfd7b943645e56da323e5e211d340851e9b4ddf1b0c6d9943bd' 
  AND token = 'awWNDWMXN+Es7NJxrKL9VMedokKzUZuzlZU7ELt8f88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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