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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffad5b417ffd8ddd27e6b49ab8a850a75624f6b063d04dfba1220e026d625c3e' 
  AND token = 'tChs5zIDcuCeF5cKf0sP1T9S7qt1gnqLYiW+StHxSqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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