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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f407f2b113811c1cf81725560ee0bc1e090e12d00cdb44f5dd166f0ecd14cb30' 
  AND token = 'HZE11yvjxJy29gCH76OZiJY0p6SsC6deNwTTuIYGzKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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