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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14553bb307cdaa0b2ac9f495a8bb1227b7c4b68e22337c829a70ae8a44a5c723' 
  AND token = '0xiiOqawUGqn6pQH40xYKVar7Etr2sryiGvisLvIP2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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