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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cef586a6b7997641aa9cd3a7b7483f861de5c097cddd175ca33afd47a90ce0' 
  AND token = 'IquDxbfA8MsVI7Ehjqayn83/3LbcJv0ltu+na6gFJ4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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