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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e275da125d5afb296beba0ebe150772996991bdf18bed9bda1a6b290e8227b9' 
  AND token = 't6It8LggLzn7bP3T4mNsj7wh1VSgTAS/ZYe48tqkkTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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