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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c77e37f44bedb549698dde51358bce4c35eb8c69fcc759d5e3445ec81c22d30' 
  AND token = '/uJjjKeLTTxIZ536F8MCzkfKFuBaBT6WcrEabmXt5Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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