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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bf4599116dfff596c4cd9661f10542c2822ee995d00df522ba137718a91b93' 
  AND token = '95+1GSlYwjDub7hraSTDQLpNX8gjc/1qnR87dR0DaXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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