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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c991f94e4dbc35148706be76c032b3bfee8e0cada6bcdee918a8e0379ed90a2e' 
  AND token = 'UrsgSb7eZBPM+GMpUGdLPrY3CYO8ftU1Oc3jxL3PGK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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