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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe1ef26b527535eb9a19ca22594c6f1a873dcebb329c36e9d74654d98bfa666' 
  AND token = '6sTbKzHg5jCqQ0TLmEtSw/HRYNtYNLGO6VLb6H6gEpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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