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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fc6b36efbd5808bd018b6ffb5c3cb6e17b94a690b62c3ec04bc2a942f1280f' 
  AND token = 'OkAHchcBN/JGUbsIIbBMUvluzaJ1KvFif99ekR/FI5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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