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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c58728b01c6140a4f00e14d936881813a2244a95374656391cd2523232bd20' 
  AND token = 'MMd3kAIo6o/V/5Kf/JvTWupmSahtdN10w6TayYuP3zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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