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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b5050c9a6222b4472c5646d2bc677244e50b9c39a66420fa89bb6086ee25e4' 
  AND token = 'fbh/DRUzAhlECYD5jV4UNoQ+yO+pU3rT4iTqO0ZrRAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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