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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aabf1bef64262e13512342d0267a733b70f6c385819b7fd4af886a37512c291' 
  AND token = '07zeIASpzNH2lkSoWHHUxPilc+hQ/vnNov+eTmEjFKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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