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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25e877dd95ae3df4970e8ce40a3000a4b1c8d26f4ef523b6f451659bbd86fa8' 
  AND token = 'V4G1vF59joiSg3hd0k4ap6cxJiAQAe9Ypslszm5izco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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