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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662bb7834136e8fc1ca40bec8d584012b7bbb1c928f6da23f2cc0533d11126b7' 
  AND token = '9jxAaBxcPVFwAI4735cQsxDXuzVNcl7TCtKSsIJax9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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