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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d962a9feb3fee7fca6b1146adc13c0c0a7b4d5f3537f8e50e0a8f7e0056a1a' 
  AND token = 'jcP/xWDAS5LZrXpUexyAAHBmfI8fmcCH1GOt5fJ2Mqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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