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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff9b3342457262b47a459f93058e87cf7bcd5f4c950a2cc077462e99bbce65b' 
  AND token = '3gH19p7X6CNseG+YIHhZ0FzcCdyLXwUe13Sp2ony9YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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