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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0baa194582c05804c86778c330b45fe7080a5e0f8997b5726ed42a42e246e2b2' 
  AND token = 'S//2TTma2kt+cdepsY9kOIOfZ3U5HolAhNOBzt9WzIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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