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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53c4aaa843985a06ef09af58dc13120e8d4d86c5293128c496c9bf8c39ced91' 
  AND token = '8ni/sLQgDDzCo1FWUM774dnPg493b6pu1ufVo73efEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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