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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b3508df7fb2a53629505a29e83d2f11a0f0387c878ca27f30b96b430dc1f3e' 
  AND token = 'WnUAJQbI9fyEwLLK6tf3vB/Df7Q5/aVTgInRrZWfW78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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