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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a32f4ecd9c804c1b579cb2f18229461474012c30a4356cde41ade0393cf1a6' 
  AND token = 'SIWPKvSz0yvN+7kSHM8eP6t+Z2Wvk/dF75O77biRkH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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