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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc6e73ccdb02295a75df6b27adf2aad6c01130b7bc7b801170a75378a6eec18' 
  AND token = 'R8ZvgWEkrKS0hJQj+mf9CYGMYqKJ7bztEIap8QEKR50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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