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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc74754330bb9e21661f21922f9a5923dae82962b8a236e4c7841dfc3fcc9522' 
  AND token = 'oIKcXuWQQlopdohz7+qbCDa4SiOPAHqEW89osLLefZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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