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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79df2f2a195e0e3033e534d4093a6b894d67b2d4630ca619e99ca608ed92add' 
  AND token = 'ZJqB2Ozb8kwd+byUitU1aaUxZMZrvmkcXXXS+0o/zIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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