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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73fc289cb12558ce4ec64a0b7173e33a58eb8389ebddee0241fc7e1c6400ec9d' 
  AND token = 'pDaZeuQERt1dggfZU3ebS4EyPx1HR5Vj+gloQjrOPos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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