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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860508f002fcb9bdcd21aa1f67fc276d2ae0cc3aebca35ef17687ff7749d2531' 
  AND token = 'jxIeQgICP0zYs/kCHbwd/ot1Mk627mEi3luFk0jqUgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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