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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ebc8d4bdb5028c2322deecd3d7eb9d172e4e4544cdaf5cba1dfc5c7728d046' 
  AND token = 'rZMYaybnH0jio41raoDW0hCbjeAL17B8I49W7oPaYGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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