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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889920614487a6c3a045ae68b73f453fafc23aeff02fa4260a4a77bdc48a20d3' 
  AND token = 'lJ3xc63apKWeGTGllp0FAE5EXlDu11qo+UygfirEWNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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