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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233ab2ff1990ad3ee413d000f5a88cd7ac0ba08a91167e5297e810c748e74dc2' 
  AND token = 'sSPhcT7ECAXudGJVWa5PTiqlIMbjXSY2pNlGEPrPP5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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