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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1dfb5eaa0d20fb97a1edfd9a1f8a85aedb7af35915ca7018a801c36e0ab79d' 
  AND token = 'mV59cbvGV2iGoXhANCVk+lkBMaYVhpKrIICNKDA8w+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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