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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9102dad1b46b4a90235f9cc3ea4f189d639603c9f548566c243e4a36045888e' 
  AND token = 'EjHzkxp1FxLyRg3/1xhiMsgToap6BMw4MbhFvlmwLmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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