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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c2fba96675501626e1e3b2ec8b69d8a4ca635b2ad1f8b8c6f1e646c2bab3ad' 
  AND token = 'HS2iuILJ7sfGlKcBd4pauKD2QkFHpfdn7Wu6UXasPxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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