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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1acc88b5cc5f37e3f96b7252772c27be8d8eec6dff2240dd2cf3fc7794a30a9a' 
  AND token = 'WUnxjSgrHBmsW1jDdubcmUBu1C1B83sYDKF5k0diQVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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