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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432509e77f724511914431a50ede3bb73bbd055a361ac5b962a9b6a6391cee0b' 
  AND token = '5s28N8DZa3cwBzrQbQPB3BgX3ArkyuKnMIfyFX7v0Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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