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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '243e21e8bd885407b8151496400c3eb68987cd682a35d296973f9ec3b9ea9a0d' 
  AND token = 'C9V+J3VutoD9360T4lWa6lZAGuXsoyfXzmi1JlmfMCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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