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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bafee0ec271098cfcefe1b7d4f00621bcb1a6f1420536bd233ae3d6fb67a00bc' 
  AND token = 'hTP++z5he0mvqmSCFXyem3pW0KE4FxXcJKFfXfyJZo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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