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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed8d62fab8a7d639a8adb7ddfd0c5ac148b09a747a174d615f6ff4430dfc1708' 
  AND token = 'AeoP/w5DzSns6aGIg+Q0z2G7O4xAnjfZzjxWUNwY4J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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