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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8b3086d309a2fe02f210a97b6d9f8ef42ef48b2d37bb6fcd23fc31822273ab' 
  AND token = 'AKjZhp9afaaS9jzYn/TusMJ8RDaMcdsI/W69nOCFFts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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