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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c061783c0aac40e802f07958ef39c6e7bfff390b5ffac165f9a5e283dcb6da22' 
  AND token = 'yAuqJYQCxY6WjVn0bl1Z4nVXxSS5L9cns53zJg2wP1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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