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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fdb54bda6c99eb22f8a0b7ba47a68b943c8f3400f2927dd6c9951e408e9a2bf' 
  AND token = 'YlFdF/WJJOQTxHrV9RYedHUk696m0CCqbSo8+Mk6yts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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