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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083e20e1f5fb0abdbbc193c8b8f84da2b6773c48d1655e446ed71e655c5af0b3' 
  AND token = '/TI0gnUHB34aJBdltPjDdljoafeBXpRVY0ZyVhlbTkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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