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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294d37146b8e7a38adf35b2a3ee68afb52adbea0d36fc471c87396180b32520d' 
  AND token = '6ggNfGK+spUGax59sOYRm2jQWkLo3JKSeMYOVIhoneo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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