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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b55c941342baa7ca03e797ae4d6fba438b29280f8946b128a56faf3ba1f0950' 
  AND token = 'DSCZyySWFUMiSI8J71+qZqmyS/UzBPe1P88ks93ml2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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