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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b801b73a32a7974cb60d0f2672534196195727a3d29e3a4a5538bc25cbe1dd4' 
  AND token = 'ZC40T03wSII5ZhHPkz9q5I63nkFGxl9+jmyzTDF66TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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