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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9b8249b1613a382d5a4b3e5556cf0c8eacf8e75cb91e73a23a5ad3fe336b1c' 
  AND token = 'FqAG+OBOTgWz770SO9krEUKk4SxMxePmW2Cwz5H/GiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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