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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244d7b060c2897e9ce8eb534c887da331299004a7414571bf00021a885ab5823' 
  AND token = 'DCfD1OloDJOy6fbGgWcqakZHJRJcpsH6t/McMTD89sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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