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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523dff17526182047f94f8e9514d70ffa0fe1c1a8cfd97e6e5b3fff2835f3050' 
  AND token = 'Wn9EvQiYKVH792mOV3BnjK68WUF/x+/Wa4006Pcr9HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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