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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984f5b6f95bfc38fbc8bd5a384a6ab4af466946c341212c6f7ef906f728b95c9' 
  AND token = '8abWAna9Tb1pbacmBEupFesL7hLcQJn6bFE6dBxrKe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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