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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8644389194f300bb2fe1b4142ff4e67881ea46876a1bf09a5d54eaf1110aa96a' 
  AND token = 'ppkUuYBQM48AKaCJZBbD5VBSXAsrJx9AM8CgrjGGVQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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